Anisotropic transport properties of NpPdAl

NpPdAlにおける異方的輸送特性

松田 達磨; 芳賀 芳範   ; 青木 大*; 本間 佳哉*; 立岩 尚之   ; 山本 悦嗣  ; 大貫 惇睦

Matsuda, Tatsuma; Haga, Yoshinori; Aoki, Dai*; Homma, Yoshiya*; Tateiwa, Naoyuki; Yamamoto, Etsuji; Onuki, Yoshichika

ZrNiAl-型結晶構造の異方的超伝導体NpPdAlについて、電気抵抗及びホール効果測定を行った。電気抵抗の温度依存性は、異方的で、電流方向[001]では、すべての温度範囲で、[100]方向より大きい値を示す。高温では、近藤効果に特徴的なの振る舞いを示す。ホール抵抗の磁場依存性は、55kOeまで線形な振る舞いを示す。ホール係数は、c軸方向で負の値を示すが、a軸方向では、温度の上昇とともに劇的に負から正の値へと変化することがわかった。

The anisotropic superconductor NpPdAl with ZrNiAl-type tetragonal structure was studied by means of electrical resistivity and Hall effect in the normal state. The temperature dependence of electrical resistivity shows a large anisotropic behavior. The resistivity for [001] is larger than that for [100] in the whole temperature region. At high temperatures is proportional to , which is characteristic behavior in Kondo effect. The field dependence of Hall resistivity shows a linear dependence up to 55 kOe with a large slope for the field. The slope of for field along -axis is negative, but for field along -axis, the slope dramatically changed from negative to positive with increasing temperature.